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June 2012

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Subject:
From:
"David D. Hillman" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 6 Jun 2012 11:20:01 -0500
Content-Type:
text/plain
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Hi Joyce - we have seen the same yellowing effect but only at Doug's desk. 
We are pretty sure it has something to do with his Diet Mt. Dew habit.

Dave



Joyce Koo <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
06/06/2012 11:10 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Joyce Koo <[log in to unmask]>


To
<[log in to unmask]>
cc

Subject
Re: [TN] Electronic assemblies packaging






Paper product has been changed dramatically in last 100 years.  I had old 
18xx copy of books, still black and white with gold edge.  My new text 
book about state of the art technology, turned yellow very quickly under 
the sun. 
Some of them smell funny too. 

Joyce Koo
Materials Researcher - Materials Interconnect Lab
Research In Motion Limited
Office: (519) 888-7465 79945
Mobile: (226) 220-4760


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey 
(EHCOE)
Sent: Wednesday, June 06, 2012 11:58 AM
To: [log in to unmask]
Subject: Re: [TN] Electronic assemblies packaging

Of course the solder joints on your radio are still shiny due to all the 
string theory buffs.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Wednesday, June 06, 2012 8:48 AM
To: [log in to unmask]
Subject: Re: [TN] Electronic assemblies packaging

Dampness will improve the static dissipation properties of the card, for
other properties I offer a personal observation rather than rigorous data:
I own an old car (~50 years) and am always on the look out for what is 
known
as N.O.S. parts. Especially electrical parts like switches, dials/gauges
etc. For non classic car fans, "NOS" means new old stock. In other words 
the
parts are also 50 or more years old, but have not been used so are in
original packing - cardboard. [This is not for sentimentality but because
the original old stock is better made than modern reproductions and does
things like work and fit.] Terminations on this old stuff are nearly 
always
perfectly clean and shiny, although the boxes are usually a little sad.
Soldered joints are bright, but what would constitute tracking (very thing
copper pieces in some gauges) is usually dull. 
50 years is about 40 more than the planned storage time and predates 
nearly
all auto electronics, so can't comment on that. [Although I do have a 
rather
modern late 1960s early 70s radio complete with push button tuning - 
string
operated of course!]

Regards


Mike

Bonding Services & Products
M: +44 [0] 7810 526 317
T: +44 [0] 1865 522 663
E: [log in to unmask]

 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Wednesday, June 06, 2012 3:23 PM
To: [log in to unmask]
Subject: Re: [TN] Electronic assemblies packaging

Maybe I missed something, but that article didn't seem too enlightening.
Isn't it common knowledge that bare copper will tarnish? 
and that silver coatings need to be protected with "silver saver" paper or
some type of good packaging until used?
(a "no brainer" study, if you ask me...)

It might not be wise to store "piles of reels" in cardboard boxes for 
nearly
a decade,
but the component termination plating on those probably aren't copper or
silver.

I thought the original question was about shipping final product, not 
about
wettability.
What is the danger of shipping AFTER SOLDERING in cardboard? 
Maybe not the cardboard, 
probably the moisture.

Jack

.
On Tue, 5 Jun 2012 20:33:27 -0400, Robert Kondner
<[log in to unmask]> wrote:

>Hi,
>
> Having used card board shelving supplies for years I was curious. I 
heard
>about solderability issues but never noticed issues. So I was wondering 
if
>this was hogwash or not.
>
> So I did a little web look up and found this note:
>
>www.kondner.com/files/cardboard_soldering.pdf
>
>Now I have parts in plastic bags and the cardboard containers do have 
small
>holes, that might help vent. Our temperature is lower probably around 20 
-
>23C.  But the result in the paper were a BIG surprise. Likes like it is a
>real issue and NOT hogwash.
>
> I have a pile of 1206 reels that have been sitting in a card board box
>without plastic bags for maybe 10 years. I will need to take a look.
>
>Bob K.



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